Intro: Tonight, The Doctor returns to his home planet, Gallifrey, to be inducted as president of the Time Lords. Lord Chesterfield said that power corrupts and absolute power corrupts absolutely. Can that possibly apply to The Doctor? Answers are forthcoming in "Invasion of Time."

Outro: Next week, The Doctor begins the quest for the segments of The Key to Time, a task that puts the labors of Hercules to shame. But then Hercules didn't have Romanadvoratrelundar to help him. [source: ChicagoEpguides]